/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.packager;

import org.jpos.core.Configurable;
import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;
import org.jpos.iso.ISOComponent;
import org.jpos.iso.ISOException;
import org.jpos.iso.ISOPackager;
import org.jpos.util.LogSource;
import org.jpos.util.Logger;

/**
 * Wrapper on standard packager
 *
 * @author bharavi gade
 * @version $Revision$ $Date$
 * @see ISOPackager
 */
public abstract class PackagerWrapper
		implements ISOPackager, LogSource, Configurable {
	protected Logger logger = null;
	protected String realm = null;
	protected ISOPackager standardPackager = null;
	protected Configuration cfg;

	public PackagerWrapper() {
		super();
	}

	public abstract byte[] pack(ISOComponent c) throws ISOException;

	public abstract int unpack(ISOComponent c, byte[] b) throws ISOException;

	public String getFieldDescription(ISOComponent m, int fldNumber) {
		return standardPackager != null ?
				standardPackager.getFieldDescription(m, fldNumber) : "";
	}

	public void setPackager(ISOPackager packger) {
		this.standardPackager = packger;
	}

	public ISOPackager getPackager() {
		return standardPackager;
	}

	public void setLogger(Logger logger, String realm) {
		this.logger = logger;
		this.realm = realm;
		if (standardPackager instanceof LogSource)
			((LogSource) standardPackager).setLogger(logger, realm);
	}

	public String getRealm() {
		return realm;
	}

	public Logger getLogger() {
		return logger;
	}

	/**
	 * requires <code>inner-packager</code> property
	 *
	 * @param cfg Configuration object
	 * @throws ConfigurationException
	 */
	public void setConfiguration(Configuration cfg)
			throws ConfigurationException {
		this.cfg = cfg;
		String packagerName = cfg.get("inner-packager");
		try {
			Class p = Class.forName(packagerName);
			setPackager((ISOPackager) p.newInstance());
			if (standardPackager instanceof Configurable)
				((Configurable) standardPackager).setConfiguration(cfg);
		} catch (ClassNotFoundException e) {
			throw new ConfigurationException("Invalid inner-packager", e);
		} catch (InstantiationException e) {
			throw new ConfigurationException("Invalid inner-packager", e);
		} catch (IllegalAccessException e) {
			throw new ConfigurationException("Invalid inner-packager", e);
		}
	}
}

